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Question

Identify the aromatic compound?

A
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B
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C
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D
None of the these
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Solution

The correct option is B
(a) The molecule is a cyclic, planar conjugated molecule having 12 π-electrons. Hence it is not an aromatic compound.

(b)

Neither cycloheptatriene nor cyclopentadiene alone is aromatic but resonance structure bears a positive charge in the seven-membered ring, giving it an aromatic character of cycloheptatrienyl cation, while the five membered ring bears a negative charge making it similar to the aromatic cyclopentadienyl anion. This charge separation is responsible for the observed dipole moment. Moreover, it is a cyclic, planar conjugated molecule with 10 π-e. Therefore, it is an aromatic compound.

(c) The molecule is cyclic, planar conjugated molecule having 8 π-e (4n) π e Therefore, it is anti-aromatic compound.

Hence option (b) is the correct answer.

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